Friction transmission belt and production method therefor

Abstract

The frictional power transmission belt includes a frictional power transmission surface formed of a composite fibrous layer containing a fibrous member, an isocyanate compound, and a resin component, wherein the fibrous member contains a cellulose-based fiber. A proportion of each of the isocyanate compound and the resin component in the composite fibrous layer may be 2 to 15% by mass.

The invention claimed is: 
     
       1. A frictional power transmission belt comprising a frictional power transmission surface formed of a composite fibrous layer comprising a fibrous member, an isocyanate compound, and a resin component, wherein the fibrous member contains a cellulose-based fiber. 
     
     
       2. The frictional power transmission belt according to  claim 1 , wherein a proportion of each of the isocyanate compound and the resin component in the composite fibrous layer is 2 to 15% by mass. 
     
     
       3. The frictional power transmission belt according to  claim 1 , wherein a mass ratio of the isocyanate compound to the resin component satisfies former:latter=95:5 to 20:80. 
     
     
       4. The frictional power transmission belt according to  claim 1 , wherein the isocyanate compound is a thermally reactive isocyanate compound. 
     
     
       5. The frictional power transmission belt according to  claim 4 , wherein the thermally reactive isocyanate compound has a dissociation temperature of 120° C. or higher. 
     
     
       6. The frictional power transmission belt according to  claim 1 , wherein the resin component is a hydrophilic resin. 
     
     
       7. The frictional power transmission belt according to  claim 1 , wherein the cellulose-based fiber is a spun yarn formed of cellulose. 
     
     
       8. The frictional power transmission belt according to  claim 1 , wherein the fibrous member further contains a synthetic fiber. 
     
     
       9. The frictional power transmission belt according to  claim 1 , which is a V-ribbed belt. 
     
     
       10. A method for producing the frictional power transmission belt according to  claim 1 , the method comprising immersing a fibrous member into a liquid composition containing an isocyanate compound and a resin component, and then heat-setting the fibrous member impregnated with the liquid composition by using a pin tenter, to form a composite fibrous layer sheet. 
     
     
       11. The method according to  claim 10 , wherein the liquid composition is an aqueous solution containing a thermally reactive isocyanate compound and a hydrophilic resin. 
     
     
       12. The method according to  claim 11 , comprising drying the fibrous member impregnated with the liquid composition by the immersion at a temperature lower than a dissociation temperature of the thermally reactive isocyanate compound. 
     
     
       13. The method according to  claim 10 , wherein a proportion of each of the isocyanate compound and the resin component in the liquid composition is 1 to 8% by mass. 
     
     
       14. The method according to  claim 13 , wherein a mass ratio of the isocyanate compound to the resin component in the liquid composition satisfies former:latter=95:5 to 20:80.